No joke. A Nashville news channel is reporting he was shot to death in downtown Nashville. A female has also been found dead. More obviously as soon as we know anything. Terrible, terrible news.
UPDATE: Darren Rovell is reporting on his twitter account that McNair was shot and killed by his wife in an apparent murder-suicide.
UPDATE 2: Now Rovell's source is pulling back on that report. No more until we actually learn something.